Fairfax County has set Dec. 2 as the deadline for submitting proposed changes in its comprehensive land-use plan to be considered in 1986. The plan is the bible for land-use decisions in the rapidly growing county.

More than 900 civic association leaders and developers, attorneys and residents have been notified of the date and procedures to be followed, according to William Keefe of the Fairfax County planning office.

"Anybody can nominate any piece of land they want to" for a change in use, planning commission Chairman George Lilly said. One does not have to own the land to make such a nomination, officials said.

Lilly said that the system has its drawbacks and that "I don't think nominating something one does not own is quite the thing to do. However, if you have to defend it -- and I don't -- this is the only way, for example, for a civic association to nominate a specific area for a change."

Last year, Fairfax was deluged with more than 350 challenges to its land-use plan. More than 75 of those have not been acted upon because special studies haven't been completed.

Nonetheless, county officials do not expect significant numbers of proposed changes for next year.

Proposed land-use changes to be acted upon next year must meet strict criteria that were not part of the 1985 review process, when the planning commission conducted hearings on all proposals. Next year, citizens task forces will determine if proposals meet requirements for planning commission consideration. These task forces must follow criteria spelled out in the county land-use plan that apply two out of every three years, including in 1986.

For example, an applicant would have to prove that a change in the use of adjacent property is affecting his land adversely to have his proposed land-use change considered.

Additional information can be obtained by phoning the Fairfax Office of Comprehensive Planning at 691-2641.